DRIEHAUS CAPITAL MANAGEMENT INC
13F-HR, 2000-05-15
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<PAGE>   1
                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    Form 13F

                              Form 13F COVER PAGE

Report for the Calendar Year or Quarter Ended:      March 31, 2000
                                                ---------------------
Check here if Amendment [ ]; Amendment Number:
                                                --------
This Amendment (Check only one.):    [ ] is a restatement.
                                     [ ] adds new holdings entries.
Institutional Investment Manager Filing this Report:

Name:        Driehaus Capital Management, Inc.
           -------------------------------------------------
Address:     25 East Erie Street
           -------------------------------------------------
             Chicago, Illinois 60611
           -------------------------------------------------

           -------------------------------------------------

Form 13F File Number: 28- 3580
                         ------------

The institutional investment manager filing this report and the person by whom
it is signed hereby represent that the person signing the report is authorized
to submit it, that all information contained herein is true, correct and
complete, and that it is understood that all required items, statements,
schedules, lists, and tables, are considered integral parts of this form.

Person Signing this Report on Behalf of Reporting Manager:

Name:        Mary H. Weiss
           -------------------------------------------------
Title:       Vice President
           -------------------------------------------------
Phone:       (312) 587-3800
           -------------------------------------------------

Signature, Place, and Date of Signing:

     M. H. Weiss                  Chicago, Illinois               May 11, 2000
- -----------------------    --------------------------------    -----------------

Report Type (Check only one.):

[X]   13F HOLDINGS REPORT. (Check here if all holdings of this reporting manager
      are reported in this report.)

[ ]   13F NOTICE. (Check here if no holdings reported are in this report, and
      all holdings are reported by other reporting manager(s).)




<PAGE>   2

[  ]   13F COMBINATION REPORT. (Check here if a portion of the holdings for
       this reporting manager are reported in this report and a portion are
       reported by other reporting manager(s).)

List of Other Managers Reporting for this Manager:

NONE







<PAGE>   3

                              Form 13F SUMMARY PAGE

Report Summary:

Number of Other Included Managers:            NOT APPLICABLE
                                            ------------------
Form 13F Information Table Entry Total:           314
                                            ------------------
Form 13F Information Table Value Total:     $ 4000813
                                            ------------------
                                                (thousands)

List of Other Included Managers:

Provide a numbered list of the name(s) and Form 13F file number(s) of all
institutional investment managers with respect to which this report is filed,
other than the manager filing this report.

NONE

<PAGE>   4


<TABLE>
<CAPTION>
                                Name of Reporting Manager: Driehaus
                                Capital Management, Inc. ("DCM")                                                  (SEC USE ONLY)
                                ----------------------------------------------------------------------------------------------------
                                                                                                                     ITEM 8:
                                                                                 ITEM 6:                        VOTING AUTHORITY
                                                                           INVESTMENT DISCRETION                    (SHARES)
                                                                          -----------------------            -----------------------
                                                                                 (b)
                                                                                SHARED
                                                              ITEM 5:            -AS              ITEM 7:
      ITEM 1:                   ITEM 2:             ITEM 4:   SHARES            DEFINED          MANAGERS
  NAME OF ISSUER                 TITLE    ITEM 3:    FAIR       OR                IN      (c)      SEE
                                  OF      CUSIP     MARKET   PRINCIPAL    (a)    INSTR.  SHARED-  INSTR.    (a)       (b)     (c)
                                 CLASS    NUMBER     VALUE     AMOUNT     SOLE     V      OTHER     V       SOLE     SHARED   NONE
                                ------   --------   ------   ---------    ----  -------  ------- --------  -------   ------ --------
<S>                             <C>      <C>       <C>      <C>           <C>   <C>       <C>    <C>       <C>        <C>   <C>
AES Corporation                 Common   00130H10    21263    270000 X                                       208959     0      61041
AO Tatneft - Sponsored ADR         ADR   03737P30      809     61600 X                                        56600     0       5000
ASM Lithography Holding NV         ADR   N0705911    28975    259287 X                                       225480     0      33807
Advanced Fibre Communication    Common   00754A10     3103     49500 X                                            0     0      49500
Advanced Lighting Technologies  Common   00753C10     2217    118234 X                                         1943     0     116291
Aeroflex Inc.                   Common     776810     1430     28888 X                                        18391     0      10497
Aetrium Inc.                    Common   00817R10      857     85739 X                                            0     0      85739
Allen Telecom Inc.              Common    1809110      829     52000 X                                            0     0      52000
Amdocs Ltd.                     Common   G0260210    68474    925328 X                                       762559     0     162769
American Tower Corp. - Cl. A    Common    2991220    13118    265678 X                                       205025     0      60653
Amkor Technologies Inc.         Common    3165210    37460    705960 X                                       542605     0     163355
Amtech Systems Inc.             Common    3233250      267     65839 X                                            0     0      65839
Anadigics Inc.                  Common    3251510     6557     99346 X                                        54917     0      44429
Analog Devices                  Common    3265410    51003    633574 X                                       487357     0     146217
Anaren Microwave Inc.           Common    3274410     1701     17741 X                                         4269     0      13472
Ansoft Corp.                    Common    3638410      786     63400 X                                            0     0      63400
Apex PC Solutions Inc.          Common    3754810    11529    310551 X                                       176358     0     134193
Applied Films Corp.             Common    3819710      317     15830 X                                            0     0      15830
Applied Innovation Inc.         Common    3791610      149     11250 X                                            0     0      11250
Applied Micro Circuits Corp.    Common   03822W10    17238    114875 X                                        88511     0      26364
Aradigm Corp.                   Common    3850510      585     28002 X                                        17706     0      10296
ArthroCare Corp.                Common    4313610    12482    135676 X                                        76903     0      58773
Aspect Communications Corp      Common   04523Q10     7606    205218 X                                       117071     0      88147
Aspect Development Inc.         Common    4523410    19027    295571 X                                       166388     0     129183
Asyst Technologies Inc.         Common   04648X10    29373    502104 X                                       283679     0     218425
Atlantic Coast Airlines Hldg.   Common    4839610     1294     50000 X                                         1945     0      48055
Avista Corp                     Common   05379B10    29303    719099 X                                       540093     0     179006
B V R Technologies                 ADR   M2051410      246     17700 X                                         9905     0       7795
BJ Services Co.                 Common    5548210    53920    729880 X                                       561940     0     167940
Banco Bradesco Spons ADR           ADR    5946010      177     21715 X                                            0     0      21715
Best Buy Company Inc.           Common    8651610    43783    509110 X                                       393833     0     115277
Blue Wave Systems Inc           Common    9608110     3743    233907 X                                         5734     0     228173
Braun's Fashions Corp.          Common   10565810     1025     40600 X                                            0     0      40600
Brooks Automation Inc           Common   11434A10    15788    252608 X                                       142658     0     109950
Business Objects S. A. Sp ADR      ADR   12328X10    28090    282316 X                                       230420     0      51896
C&D Technologies Inc.           Common   12466110     1265     21440 X                                        13658     0       7782
CE Franklin Ltd.                Common   12515110      602     83000 X                                            0     0      83000
CIMA Labs Inc.                  Common   17179610      394     22941 X                                            0     0      22941
CVC Inc                         Common   12694510      947     29837 X                                            0     0      29837
Cadus Pharmaceutical            Common   12763910      128     64832 X                                            0     0      64832
California Amplifier Inc.       Common   12990010     2946     95027 X                                         1496     0      93531
</TABLE>


<PAGE>   5


<TABLE>
<CAPTION>
                                Name of Reporting Manager: Driehaus
                                Capital Management, Inc. ("DCM")                                                  (SEC USE ONLY)
                                ----------------------------------------------------------------------------------------------------
                                                                                                                     ITEM 8:
                                                                                 ITEM 6:                        VOTING AUTHORITY
                                                                           INVESTMENT DISCRETION                    (SHARES)
                                                                          -----------------------            -----------------------
                                                                                 (b)
                                                                                SHARED
                                                              ITEM 5:            -AS              ITEM 7:
      ITEM 1:                   ITEM 2:             ITEM 4:   SHARES            DEFINED          MANAGERS
  NAME OF ISSUER                 TITLE    ITEM 3:    FAIR       OR                IN      (c)      SEE
                                  OF      CUSIP     MARKET   PRINCIPAL    (a)    INSTR.  SHARED-  INSTR.    (a)       (b)     (c)
                                 CLASS    NUMBER     VALUE     AMOUNT     SOLE     V      OTHER     V       SOLE     SHARED   NONE
                                ------   --------   ------   ---------    ----  -------  ------- --------  -------   ------ --------
<S>                             <C>      <C>       <C>      <C>           <C>   <C>       <C>    <C>       <C>        <C>   <C>
California Micro Devices Corp.  Common   13043910     4859    177086 X                                         3264     0     173822
Calpine Corporation             Common   13134710    14100    150000 X                                       116083     0      33917
CardioDynamics Intl. Corp.      Common   14159710     6282    733678 X                                       225788     0     507890
Career Education Corp.          Common   14166510     1256     35885 X                                        22827     0      13058
Catalysts Semiconductor Inc.    Common   14888110      476     56807 X                                            0     0      56807
Celeritek Inc.                  Common   15092610     4429     70028 X                                         1906     0      68122
Celgene Corp.                   Common   15102010    18975    190585 X                                       107853     0      82732
Cell Genesys Inc.               Common   15092110      604     28354 X                                         7618     0      20736
Centura Software Corporation    Common   15640W10      647     62708 X                                            0     0      62708
Cephalon Inc.                   Common   15670810     9855    262795 X                                       148827     0     113968
Cerner Corp.                    Common   15678210    11193    414541 X                                       236517     0     178024
Chartered Semiconductor ADR        ADR   16133R10    38657    410153 X                                       356125     0      54028
Check Point Software Tech.         ADR   M2246510    66798    390486 X                                       307161     0      83325
Chico's Fas Inc.                Common   16861510      712     42000 X                                         1650     0      40350
China.com                          ADR   G2108N10    65757    811811 X                                       533437     0     278374
Cia Parananese Ener. -
    Sp. ADR P                      ADR   20441B40      289     34000 X                                        33000     0       1000
Clickaction Inc.                Common   18681E10     2485     50071 X                                          609     0      49462
Closure Medical Corporation     Common   18909310     1567     59696 X                                        10631     0      49065
Coherent Inc.                   Common   19247910     7730    148655 X                                        84084     0      64571
Communications Systems Inc.     Common   20390010      576     32900 X                                            0     0      32900
Concord Camera Corp.            Common   20615610     2736     49746 X                                         3942     0      45804
CoorsTek Inc                    Common   21702010     1288     32007 X                                          949     0      31058
Corning Inc.                    Common   21935010    42638    219784 X                                       169774     0      50010
Corsair Communications Inc.     Common   22040610      729     38094 X                                        10491     0      27603
Cree Inc.                       Common   22544710    22517    199490 X                                       101550     0      97940
Cubist Pharmaceuticals Inc.     Common   22967810      643     15349 X                                          626     0      14723
CyberOptics Corp.               Common   23251710      731     17217 X                                            0     0      17217
Cytyc Corporation               Common   23294610    73586   1525103 X                                       814226     0     710877
DII Group Inc.                  Common   23294910     1943     17187 X                                            0     0      17187
Datalink Corp                   Common   23793410      221     11068 X                                            0     0      11068
Datastream Systems Inc.         Common   23812410    17444    601502 X                                       338629     0     262873
Datum Inc.                      Common   23820810     1568     67992 X                                            0     0      67992
Diacrin Inc.                    Common   25243N10      259     21507 X                                            0     0      21507
Diamond Offshore Drilling       Common   25271C10    28755    720000 X                                       557204     0     162796
Digital Lightwave Inc.          Common   25385510    14753    236758 X                                        98705     0     138053
Digital Microwave Corp.         Common   25385910    27974    825791 X                                       630242     0     195549
Digitran Systems Inc.           Common   25389810       56    373200 X                                       150000     0     223200
Diodes Inc.                     Common   25454310      450     12000 X                                            0     0      12000
Discovery Laboratories Inc.     Common   25466810      111     17052 X                                            0     0      17052
Ditech Communications           Common   25500M10   108571   1023651 X                                       610505     0     413146
Dollar General                  Common   25666910     9675    450000 X                                       347687     0     102313
Dot Hill Systems Corp           Common   25848T10     1181     94500 X                                        60383     0      34117
Dynegy Inc                      Common   26816Q10    49759    793168 X                                       611007     0     182161
E C C S Inc                     Common   26825H10      904     62342 X                                         5448     0      56894
E*Trade Group Inc.              Common   26924610    10052    333669 X                                       258017     0      75652
Eight X Eight Inc               Common   28291210     1085     36614 X                                         1422     0      35192
Elan Corp. PLC - Spons. ADR        ADR   28413120    37951    798965 X                                       707035     0      91930
Elantec Semiconductor           Common   28415510     2489     33834 X                                        11411     0      22423
Emcee Broadcast Products        Common   26865010      226     34169 X                                            0     0      34169
Emcore Corp                     Common   29084610    10021     87094 X                                        48834     0      38260
</TABLE>


<PAGE>   6


<TABLE>
<CAPTION>
                                Name of Reporting Manager: Driehaus
                                Capital Management, Inc. ("DCM")                                                  (SEC USE ONLY)
                                ----------------------------------------------------------------------------------------------------
                                                                                                                     ITEM 8:
                                                                                 ITEM 6:                        VOTING AUTHORITY
                                                                           INVESTMENT DISCRETION                    (SHARES)
                                                                          -----------------------            -----------------------
                                                                                 (b)
                                                                                SHARED
                                                              ITEM 5:            -AS              ITEM 7:
      ITEM 1:                   ITEM 2:             ITEM 4:   SHARES            DEFINED          MANAGERS
  NAME OF ISSUER                 TITLE    ITEM 3:    FAIR       OR                IN      (c)      SEE
                                  OF      CUSIP     MARKET   PRINCIPAL    (a)    INSTR.  SHARED-  INSTR.    (a)       (b)     (c)
                                 CLASS    NUMBER     VALUE     AMOUNT     SOLE     V      OTHER     V       SOLE     SHARED   NONE
                                ------   --------   ------   ---------    ----  -------  ------- --------  -------   ------ --------
<S>                             <C>      <C>       <C>      <C>           <C>   <C>       <C>    <C>       <C>        <C>   <C>
Emmis Broadcasting Cl A         Common   29152510    22552    484980 X                                       374615     0     110365
Emulex Corp.                    Common   29247520    33749    309271 X                                       139086     0     170185
Ensco International Inc.        Common   26874Q10    30682    849325 X                                       655157     0     194168
Ericsson (L.M.) Tel
    Co-Spons ADR                   ADR   29482140    12847    136941 X                                       115312     0      21629
Exabyte Corporation             Common   30061510      614     82581 X                                            0     0      82581
Exar Corp.                      Common   30064510     2480     34649 X                                         8108     0      26541
Exodus Communications Inc.      Common   30208810    42083    299526 X                                       231336     0      68190
Extended Systems Inc.           Common   30197310     2968     26982 X                                         1749     0      25233
FSI International Inc.          Common   30263310     1019     49685 X                                         1873     0      47812
Fei Co                          Common   30241L10     1205     40512 X                                         1572     0      38940
Firstcom Corp                   Common   33763T10    16733    489442 X                                       419690     0      69752
Flag Communications             Common   G3529L10     5017    221755 X                                       193751     0      28004
Flextronics Intl Ltd               ADR   Y2573F10    18147    257637 X                                       211515     0      46122
Forest Laboratories Inc.        Common   34583810     8191     96935 X                                        75023     0      21912
Forrester Research Inc          Common   34656310     1575     29031 X                                        18484     0      10547
Fundtech Ltd.                      ADR   M4709510      467     17968 X                                        11410     0       6558
Gadzooks Inc.                   Common   36255310     1091     50301 X                                          772     0      49529
Gasonics International Corp     Common   36727810    21913    552581 X                                       313990     0     238591
Gemstar Intl                    Common   G3788V10     3192     37118 X                                        28255     0       8863
General Magic                   Common   37025310     1367    152953 X                                         4202     0     148751
Genset - Spons Adr                 ADR   37244T10      361     11113 X                                         3655     0       7458
Genus Inc.                      Common   37246110     4087    294529 X                                         3321     0     291208
Glenayre Tech Inc               Common   37789910      910     51796 X                                            0     0      51796
Global Datatel Inc              Common   37934G10       42     10000 X                                            0     0      10000
Globalnet Financial.com         Common   37937R20      859     23946 X                                        15160     0       8786
Globo Cabo SA Spons ADR            ADR   37957X10    31525   1681344 X                                      1476032     0     205312
Golden Telecom Inc.                ADR   38122G10      624     13725 X                                         9725     0       4000
Grey Wolf                       Common   39788810     1302    330644 X                                         6865     0     323779
Grupo Financiero
    Bancomer-Sp ADR                ADR   40048630      205     18182 X                                            0     0      18182
Grupo Radio Centro Ads             ADR   40049C10      305     22667 X                                            0     0      22667
Guess ? Inc.                    Common   40161710     2008     62764 X                                        40031     0      22733
Gulf Canada Resources
    Ltd. - Ord.                 Common   40218L30       37     10000 X                                            0     0      10000
HS Resources Inc.               Common   40429710      634     30000 X                                            0     0      30000
Hanover Compressor Co.          Common   41076810    59427   1044879 X                                       548658     0     496221
Harmonic Lightwaves Inc.        Common   41316010    14954    179632 X                                       136053     0      43579
Hathaway Corp.                  Common   41901110      318     37442 X                                            0     0      37442
HearMe Inc                      Common   42190310      476     18842 X                                            0     0      18842
Homeseekers.com                 Common   43760510      396     25755 X                                         1010     0      24745
Horizon Offshore Inc.           Common   44043J10      185     20000 X                                            0     0      20000
Hot Topic Inc.                  Common   44133910    24317    694777 X                                       394137     0     300640
ICICI Limited spons ADR            ADR   44926P20      439     19289 X                                        19289     0          0
Immunex Corp.                   Common   45252810    31372    494540 X                                       381004     0     113536
Information Architects Corp     Common   45669R10     1008     58033 X                                         1201     0      56832
Insituform Technologies -
    Cl. A                       Common   45766710     1818     59347 X                                        38219     0      21128
Integral Systems Inc            Common   45810H10     1618     35961 X                                         9665     0      26296
Integrated Silicon Solut        Common   45812P10     2946    100519 X                                        57111     0      43408
Intelect Communications Inc.    Common   45814410      276     47686 X                                            0     0      47686
Intl Fibercom Inc               Common   45950T10    28414   1196385 X                                       675523     0     520862
Ion Networks Inc.               Common   46205P10     3771    112145 X                                         2034     0     110111
JDS Uniphase Corp               Common   46612J10    20528    170265 X                                       131174     0      39091
</TABLE>


<PAGE>   7


<TABLE>
<CAPTION>
                                Name of Reporting Manager: Driehaus
                                Capital Management, Inc. ("DCM")                                                  (SEC USE ONLY)
                                ----------------------------------------------------------------------------------------------------
                                                                                                                     ITEM 8:
                                                                                 ITEM 6:                        VOTING AUTHORITY
                                                                           INVESTMENT DISCRETION                    (SHARES)
                                                                          -----------------------            -----------------------
                                                                                 (b)
                                                                                SHARED
                                                              ITEM 5:            -AS              ITEM 7:
      ITEM 1:                   ITEM 2:             ITEM 4:   SHARES            DEFINED          MANAGERS
  NAME OF ISSUER                 TITLE    ITEM 3:    FAIR       OR                IN      (c)      SEE
                                  OF      CUSIP     MARKET   PRINCIPAL    (a)    INSTR.  SHARED-  INSTR.    (a)       (b)     (c)
                                 CLASS    NUMBER     VALUE     AMOUNT     SOLE     V      OTHER     V       SOLE     SHARED   NONE
                                ------   --------   ------   ---------    ----  -------  ------- --------  -------   ------ --------
<S>                             <C>      <C>       <C>      <C>           <C>   <C>       <C>    <C>       <C>        <C>   <C>
KLA-Tencor Corporation          Common   48248010    40447    480081 X                                       369663     0     110418
Kenneth Cole Productions        Common   19329410     1909     48645 X                                        30943     0      17702
Key Energy Group                Common   49291410    34629   2994904 X                                      1662566     0    1332338
Knight/trimark Grp Cl A         Common   49906810    19284    378115 X                                       292502     0      85613
Kohls Corp.                     Common   50025510    37098    361934 X                                       283217     0      78717
Kos Pharmaceuticals Inc.        Common   50064810      489     34282 X                                            0     0      34282
Kulicke & Soffa Industries      Common   50124210    31834    496919 X                                       280731     0     216188
LJL Biosystems Inc.             Common   50187310     1093     59891 X                                          582     0      59309
LTX Corp.                       Common   50239210    25383    561716 X                                       430935     0     130781
Lam Research Corp.              Common   51280710    64670   1435116 X                                      1104177     0     330939
Lightpath Tech Inc              Common   53225710      778     17250 X                                          654     0      16596
Lukoil Holding - Spons ADR         ADR   67786210     6072     97300 X                                        94300     0       3000
M R V Communications            Common   55347710    43565    475472 X                                       316950     0     158522
M Systems Flsh Dsk Pionr           ADR   M7061C10      817     15421 X                                          570     0      14851
M T I Technology Corp           Common   55390310     4258    161443 X                                        74050     0      87393
MYWEB INC                       Common   62845110      656     50966 X                                        19725     0      31241
Macrovision Corp                Common   55590410     1273     14786 X                                            0     0      14786
Madge Networks N V                 ADR   N5424G10      662     77839 X                                            0     0      77839
Magic Software                     ADR   55916610     3273    172250 X                                        65903     0     106347
Mattson Technology Inc          Common   57722310     9443    221540 X                                       125659     0      95881
Maverick Tube                   Common   57791410     2905     89572 X                                         3481     0      86091
Maxtor Corp.                    Common   57772920    16269   1257499 X                                       680735     0     576764
Maxx Petroleum Ltd.                ADR   57777D20       29     10000 X                                            0     0      10000
MedImmune Inc.                  Common   58469910    15714     90246 X                                        69775     0      20471
Mercury Interactive Corp        Common   58940510    24072    303744 X                                       228470     0      75274
Methode Electronics - Cl. A     Common   59152020     1205     23865 X                                        15634     0       8231
Metromedia Fiber Network        Common   59168910    29454    304434 X                                       234760     0      69674
Micro Component Tech            Common   59479Q10      575     63000 X                                            0     0      63000
Microcell Telecommunications       ADR   59501T30    23243    523796 X                                       320842     0     202954
Microsemi Corp.                 Common   59513710      915     26702 X                                         1034     0      25668
Microtest                       Common   59494110     1485    100684 X                                            0     0     100684
Mih Ltd Tort Shs A              Common   G6116R10    10166    166653 X                                       137785     0      28868
N I I Norsat Intl Inc           Common   65651210      588     50373 X                                         1725     0      48648
NBTY Inc.                       Common   62878210     3815    278727 X                                       157621     0     121106
NETRO CORP                      Common   64114R10    13868    213295 X                                       166228     0      47067
NEXT LEVEL COMMUNICATION INC    Common   65333U10     9955     91543 X                                        70794     0      20749
NS Group Inc.                   Common   62891610      709     43480 X                                         1595     0      41885
NTL Incorporated                Common   62940710    10966    118151 X                                        91521     0      26631
Nabors Industries Inc.          Common   62956810    41127   1059629 X                                       816126     0     243503
Napro Biotherapeutics           Common   63079510      258     30834 X                                            0     0      30834
National Discount Broker        Common   63564610    34006    688727 X                                       390271     0     298456
National Oilwell Inc            Common   63707110    28446    921344 X                                       523620     0     397724
Netamerica.com                  Common   64108J10      328     13000 X                                            0     0      13000
Netlojix Communications         Common   64114310      588     98958 X                                            0     0      98958
Netrix Corp.                    Common   64114810     1907     94453 X                                         2432     0      92021
Network Appliance Corp          Common   64120L10    22597    273080 X                                       210981     0      62099
Network Solutions               Common   64121Q10    15489    100759 X                                        77742     0      23017
Newhall Land & Farming
    Co. - LP                    Common   65142610     2684     95000 X                                        12807     0      82193
Newport Corp.                   Common   65182410    22480    166521 X                                        83406     0      83115
News Corp Ltd-Adr               Common   65248770    12113    215338 X                                       183226     0      32112
</TABLE>


<PAGE>   8


<TABLE>
<CAPTION>
                                Name of Reporting Manager: Driehaus
                                Capital Management, Inc. ("DCM")                                                  (SEC USE ONLY)
                                ----------------------------------------------------------------------------------------------------
                                                                                                                     ITEM 8:
                                                                                 ITEM 6:                        VOTING AUTHORITY
                                                                           INVESTMENT DISCRETION                    (SHARES)
                                                                          -----------------------            -----------------------
                                                                                 (b)
                                                                                SHARED
                                                              ITEM 5:            -AS              ITEM 7:
      ITEM 1:                   ITEM 2:             ITEM 4:   SHARES            DEFINED          MANAGERS
  NAME OF ISSUER                 TITLE    ITEM 3:    FAIR       OR                IN      (c)      SEE
                                  OF      CUSIP     MARKET   PRINCIPAL    (a)    INSTR.  SHARED-  INSTR.    (a)       (b)     (c)
                                 CLASS    NUMBER     VALUE     AMOUNT     SOLE     V      OTHER     V       SOLE     SHARED   NONE
                                ------   --------   ------   ---------    ----  -------  ------- --------  -------   ------ --------
<S>                             <C>      <C>       <C>      <C>           <C>   <C>       <C>    <C>       <C>        <C>   <C>
Nice Systems Limited -
    Spons ADR                      ADR   65365610    56183    788531 X                                       688391     0     100140
Nokia Corp Spons ADR               ADR   65490220    10801     48652 X                                        48552     0        100
Novellus                        Common   67000810    55295    985209 X                                       757744     0     227465
Nuevo Grupo Iusacell -ADR V        ADR   67051210      340     16806 X                                        12064     0       4742
Numerex Corp                    Common   67053A10      402     32848 X                                            0     0      32848
Nur Macroprinters Ltd              ADR   M7516510      516     34987 X                                         9798     0      25189
O S I Systems Inc               Common   67104410      443     30000 X                                            0     0      30000
ODS Networks Inc.               Common   67082N10     1821     75870 X                                            0     0      75870
OSI Pharmaceuticals Inc.        Common   67104010      659     33779 X                                            0     0      33779
Oak Technology Inc              Common   67180210     4671    242647 X                                       137361     0     105286
Objective Systems Integrator    Common   67442410      867     57081 X                                            0     0      57081
Optimal Robotics Corp              ADR   68388R20     4340     92340 X                                        26150     0      66190
Orbotech Ltd.                      ADR   M7525310    18937    222789 X                                       193144     0      29645
Orthologic Corp                 Common   68750J10     1069    174598 X                                            0     0     174598
Overland Data Inc.              Common   69021310     1041     74017 X                                            0     0      74017
P-Com Inc                       Common   69326210      917     49553 X                                            0     0      49553
PC - Tel Inc.                   Common   69325Q10    32752    435242 X                                       247716     0     187526
PE Corp-PE Biosystems           Common   69332S10    42855    444090 X                                       342131     0     101959
PF Changs China Bistro Inc.     Common   69333Y10      585     17653 X                                          687     0      16966
PMC - Sierra Inc.               Common   69344F10    31558    154933 X                                       119550     0      35383
Patina Oil & Gas Corp           Common   70322410      434     32000 X                                            0     0      32000
Patterson Energy Inc            Common   70341410    19918    627323 X                                       338490     0     288833
Pegasus Communications          Common   70590410    12601     89527 X                                        51118     0      38409
Pennaco Energy                  Common   70804610      548     40000 X                                            0     0      40000
Performance Tech Inc            Common   71376K10     1166     26852 X                                         1017     0      25835
Pericom Semiconductor           Common   71383110     1094     30663 X                                          771     0      29892
Petroleo Brasileiro S.A.
    ADR Pfd                        ADR   71654V10    23871    876950 X                                       858256     0      18694
Pharmacopeia Inc                Common   71713B10    14592    297793 X                                       163349     0     134444
Photon Dynamics Inc             Common   71936410     3968     57506 X                                        12341     0      45165
Planar Systems Inc              Common   72690010      633     53860 X                                         2053     0      51807
Plato Learning                  Common   72764Y10     1325    110445 X                                        17407     0      93038
Powerwave Tech Inc              Common   73936310     1290     10323 X                                            0     0      10323
Precision Drilling Corp.           ADR   74022D10     1603     48015 X                                        27150     0      20865
Precision Optics Corp./Mass.    Common   74029410      790     34739 X                                            0     0      34739
Primus Knowledge Solutions      Common   74163Q10     2185     25405 X                                        14086     0      11319
Private Bancorp Inc             Common   74296210     1151    109662 X                                            0     0     109662
Qlogic Corp                     Common   74727710    40206    296722 X                                       228686     0      68036
Qualcomm Inc.                   Common   74752510    15050    100796 X                                        77291     0      23505
RIT Technologies Ltd            Common   M8215N10      816     75888 X                                        14249     0      61639
Radcom Ltd.                        ADR   M8186510     1689    127453 X                                            0     0     127453
Radyne Comstream Inc            Common   75061140     1633     61208 X                                          760     0      60448
Redback Networks                Common   75720910     9334     31119 X                                        23694     0       7425
Remec Inc                       Common   75954310    15906    314980 X                                       157711     0     157269
Research in Motion Inc             ADR   76097510    29860    280373 X                                       233281     0      47092
Robotic Vision Systems          Common   77107410     3364    210264 X                                        57219     0     153045
S C M Microsystems Inc          Common   78401810    14649    151024 X                                        85364     0      65660
SK Telecom Co Ltd-ADR              ADR   78440P10    36821    944119 X                                       823462     0     120657
Salton Inc                      Common   79575710     7357    169607 X                                        92157     0      77450
Sandisk Corp                    Common   80004C10    62982    514140 X                                       396532     0     117608
Sangstat Medical Corp           Common   80100310     8194    295943 X                                       167968     0     127975
</TABLE>


<PAGE>   9


<TABLE>
<CAPTION>
                                Name of Reporting Manager: Driehaus
                                Capital Management, Inc. ("DCM")                                                  (SEC USE ONLY)
                                ----------------------------------------------------------------------------------------------------
                                                                                                                     ITEM 8:
                                                                                 ITEM 6:                        VOTING AUTHORITY
                                                                           INVESTMENT DISCRETION                    (SHARES)
                                                                          -----------------------            -----------------------
                                                                                 (b)
                                                                                SHARED
                                                              ITEM 5:            -AS              ITEM 7:
      ITEM 1:                   ITEM 2:             ITEM 4:   SHARES            DEFINED          MANAGERS
  NAME OF ISSUER                 TITLE    ITEM 3:    FAIR       OR                IN      (c)      SEE
                                  OF      CUSIP     MARKET   PRINCIPAL    (a)    INSTR.  SHARED-  INSTR.    (a)       (b)     (c)
                                 CLASS    NUMBER     VALUE     AMOUNT     SOLE     V      OTHER     V       SOLE     SHARED   NONE
                                ------   --------   ------   ---------    ----  -------  ------- --------  -------   ------ --------
<S>                             <C>      <C>       <C>      <C>           <C>   <C>       <C>    <C>       <C>        <C>   <C>
Santa Fe Intl Corp Com          Common   G7805C10    22490    607848 X                                       469840     0     138008
Sapient Corporation             Common   80306210    16167    192751 X                                       148746     0      44005
Satyam Infoway Ltd ADR             ADR   80409910    47785    891092 X                                       634505     0     256587
Schwab (Charles) Corp.          Common   80851310    46605    824866 X                                       637340     0     187526
Sciclone Pharmaceuticals Inc.   Common   80862K10      519     33760 X                                         1311     0      32449
Scientific Learning Corp        Common   80876010      325     12697 X                                         7865     0       4832
Scientific-Atlanta Inc.         Common   80865510    66775   1055737 X                                       815831     0     239906
Seacor Smit Inc.                Common   81190410      906     15000 X                                          591     0      14409
Sega Systems Inc.               Common   78661010    18390    514406 X                                       295883     0     218523
Seibel Systems Inc              Common   82617010    31771    266004 X                                       205844     0      60160
Semitool Inc                    Common   81690910     1421     78130 X                                            0     0      78130
Sensar Corp                     Common   81725310     1256     26928 X                                         1053     0      25875
Sepracor Inc.                   Common   81731510    27305    374998 X                                       287820     0      87178
Shaw Group Inc                  Common   82028010     1058     30000 X                                         1027     0      28973
Shire Pharmaceuticals
    Gr. - ADR                      ADR   82481R10    74713   1457806 X                                      1236246     0     221560
Silicon Storage Tech            Common   82705710    26490    358576 X                                       196420     0     162156
Silicon Valley Bankshares       Common   82706410    26342    366494 X                                       207091     0     159403
Socket Communications           Common   83367210      634     27890 X                                            0     0      27890
Sonic Solutions                 Common   83546010      737     79641 X                                            0     0      79641
Spectrum Control Inc.           Common   84761510      435     37826 X                                            0     0      37826
St Assembly Test Services
    Ltd ADR                        ADR   85227G10    25811    532181 X                                       470676     0      61505
Star Media                      Common   85554610     6760    224850 X                                       180577     0      44273
Starbucks Corp.                 Common   85524410    15135    337738 X                                       261218     0      76520
Stillwater Mining Co            Common   86074Q10    32357    808930 X                                       425299     0     383631
Superior Energy Services Inc.   Common   86815710      897     91975 X                                         3464     0      88511
SurModics Inc.                  Common   86887310      569     20692 X                                        13131     0       7561
Swift Energy Co.                Common   87073810     1671     93480 X                                         2470     0      91010
TTI Team Telecom Intl Ltd          ADR   M8825810      623     18890 X                                            0     0      18890
TV Azteca SA - Spons ADR           ADR   90114510     1589    107733 X                                        98733     0       9000
Taiwan Semiconductor ADR           ADR   87403910    25270    443340 X                                       383140     0      60200
Tandy Corp.                     Common   87538210    12688    250000 X                                       193250     0      56750
Tegal Corp                      Common   87900810      776    117154 X                                            0     0     117154
Tele Nordeste Cel Partic-ADR       ADR   87924W10     1227     17100 X                                        17100     0          0
Tele Norte Leste Participacoes     ADR   87924610      477     17929 X                                         9900     0       8029
Telecom Semiconductor           Common   87921P10     1154     38150 X                                         1464     0      36686
Telefonos de Mexico - Sp. ADR L    ADR   87940378    11713    174822 X                                       148301     0      26521
Teletech Holdings Inc           Common   87993910    13028    377623 X                                       213908     0     163715
Teligent Inc Cl A               Common   87959Y10     1869     27969 X                                        21652     0       6317
Texas Biotechnology Corp        Common   88221T10     5611    392007 X                                       222757     0     169250
Theragenics Corp.               Common   88337510      816     61000 X                                            0     0      61000
Three-Five Systems Inc.         Common   88554L10    10629    177148 X                                        88694     0      88454
Tiffany & Co.                   Common   88654710    34999    418522 X                                       323462     0      95060
Titan Corp.                     Common   88826610    44651    880224 X                                       501327     0     378897
Tollgrade Communications        Common   88954210     1097     20705 X                                         9618     0      11087
Trico Marine Services           Common   89610610      397     45000 X                                            0     0      45000
Trikon Technologies Inc         Common   89618740      882     61895 X                                            0     0      61895
Triquint Semiconductor          Common   89674K10     5763     78404 X                                        60545     0      17859
Triton Energy Ltd.              Common   G9075110    30864    880255 X                                       499000     0     381255
Tubos De Acero De Mexico -
   Sp. ADR                         ADR   89859250      310     18909 X                                         6300     0      12609
U T I Energy Corp               Common   90338710    33020    874706 X                                       484009     0     390697
</TABLE>


<PAGE>   10


<TABLE>
<CAPTION>
                                Name of Reporting Manager: Driehaus
                                Capital Management, Inc. ("DCM")                                                  (SEC USE ONLY)
                                ----------------------------------------------------------------------------------------------------
                                                                                                                     ITEM 8:
                                                                                 ITEM 6:                        VOTING AUTHORITY
                                                                           INVESTMENT DISCRETION                    (SHARES)
                                                                          -----------------------            -----------------------
                                                                                 (b)
                                                                                SHARED
                                                              ITEM 5:            -AS              ITEM 7:
      ITEM 1:                   ITEM 2:             ITEM 4:   SHARES            DEFINED          MANAGERS
  NAME OF ISSUER                 TITLE    ITEM 3:    FAIR       OR                IN      (c)      SEE
                                  OF      CUSIP     MARKET   PRINCIPAL    (a)    INSTR.  SHARED-  INSTR.    (a)       (b)     (c)
                                 CLASS    NUMBER     VALUE     AMOUNT     SOLE     V      OTHER     V       SOLE     SHARED   NONE
                                ------   --------   ------   ---------    ----  -------  ------- --------  -------   ------ --------
<S>                             <C>      <C>       <C>      <C>           <C>   <C>       <C>    <C>       <C>        <C>   <C>
Uniroyal Tech Corp              Common   90916310     1265     26910 X                                         1036     0      25874
VCAMPUS CORPORATION             Common   92240C10      890     82797 X                                            0     0      82797
Valuevision Intl Cl A           Common   92047K10    15272    369113 X                                       209264     0     159849
Varian Semiconductor
   Equipment Assoc.             Common   92220710    18846    296204 X                                       225876     0      70328
Veeco Instruments Inc           Common   92241710    20662    279222 X                                       155845     0     123377
Verity Inc                      Common   92343C10     5605    137547 X                                        76985     0      60562
Virata                          Common   92764610    33581    336232 X                                       259317     0      76915
Vitafort International Corp.    Common   92846730       36    100000 X                                            0     0     100000
Vitesse Semiconductor Corp.     Common   92849710    22889    237807 X                                       183239     0      54568
Volt Info Sciences Inc          Common   92870310      683     19000 X                                            0     0      19000
Wal-Mart Stores Inc.            Common   93114210     5594     99000 X                                            0     0      99000
Waters Corp.                    Common   94184810    56516    593343 X                                       456846     0     136497
Weatherford International       Common   94707410    56564    966904 X                                       744607     0     222297
Webstreet Inc                   Common   94733610      431     51900 X                                            0     0      51900
World Wrestling Fed
   Entertainment                Common   98156Q10      426     24000 X                                            0     0      24000
XOMA Corp.                      Common   G9825R10      634     81840 X                                            0     0      81840
Xicor Inc.                      Common   98490310     8156    577421 X                                       287283     0     290138
Zoll Medical Corp.              Common   98992210     1537     29981 X                                        19111     0      10870
Zoran Corp.                     Common   98975F10     2099     37266 X                                         1454     0      35812
Zygo Corp.                      Common   98985510     1155     23934 X                                          929     0      23005
e-Sim Limited                      ADR   M4099010     1240     55093 X                                            0     0      55093
polymedia corp                  Common   73173810      860     14632 X                                         9292     0       5340
varian inc.                     Common   92220610    23011    599648 X                                       339224     0     260424
                                                   4000813  78129849                                       48708789         29421060
</TABLE>


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